tee
A {Unix} command which copies its
{standard input} to its {standard output} (like {cat}) but
also to a file given as its argument. tee is thus useful in
{pipeline}s of {Unix} commands (see {plumbing}) where it
allows you to create a duplicate copy of the data stream.
E.g.
egrep Unix Dictionary | tee /dev/tty | wc -l
searches for lines containing the string "Unix" in the file
"Dictionary", prints them to the terminal (/dev/tty) and
counts them.
{Unix manual page}: tee(1).
[{Jargon File}]
(1996-01-22)